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Answers

The base uracil isn't found in DNA. The base pairs are A-T and C-G for DNA while in RNA has adenine, guanine, cytosine but instead of the thymine pairing with Adenine it pairs with Uracil instead in RNA: A-U & C-G Thymine is produced only in the double helix and because RNA is single helix, uracil takes the place of thymine. And this is necessary because the RNA is the messenger among other things that help determine you genes and etc.